My line at Colt (which had proved to be very reliable) told me that they were orginally made for export, the details of which I'll save you.

The export contract got fouled up, and about 300 came back. Most looked like R6520s, a few looked like R6530s. All had large front pivot pins, large firecontrols, A2 reinforcements, and sear blocks. All in all, a good looking gun. Also, the 300 that came back were in the upper end of the serial number range, usually somewhere between about 1300 and about 1600.

COLT CARBINE VERY RARE!!! $3,199.00 This was a export modelthat was marked COLT CARBINE it is the sameconfiguration as a Gov,t carbine. Below is the feed back that I recvd. fromStokes on AR-15.com. My line at Colt(which had proved to be very reliable)told me that they were orginally made forexport, the details of which I,llsave you. The export contract got fouledup, and about 300 came back. Most lookedlike R6520s, a few looked like R6530s.All had large front pivot pins, largefirecontrols, A2 reinforcements, and searblocks. All in all, a good looking gun.Also, the 300 that came back were in theupper end of the serial number range,usually somewhere between about 1300 andabout 1600. As for price, it,s hardto say. It,s gotta be worthmore than a blue lable R6520. Maybe evenmore than a green lable R6520, but howmuch more would be more dependand on thecollector. Seller: LAKES AREA GUN KELLY KYLEGunsAmerica Number:976210801 Area Code: 918 FFL Dealer: Yes